Miller, Kempster Blanchard, 1870-1933 · New York : McGraw publishing company · leaf 164
it wiring 142 AMERICAN TELEPHONE PRACTICE. of the box is made somewhat simpler by mounting the coil in thebell box. Since the use of the dry cell has become very common for localbattery telephones, a new type of wall set has come into vogxiewherein the call bell, generator, switch-hdok, induction… … FIG. 117.-SERIES CIRCUIT-COIL IN BELL BOX. by nearly all of the telephone manufacturers and is proving popular.It is perhaps more convenient, and neaterin appearance than inthe old types wherein a large battery box is provided for the wetcells. In this latter type a shelf for the convenience of the…
Telephone
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